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        <h2 id="第六章-java数据库编程"><a href="#第六章-java数据库编程" class="headerlink" title="第六章 java数据库编程"></a>第六章 java数据库编程</h2><h3 id="6-1JDBC"><a href="#6-1JDBC" class="headerlink" title="6.1JDBC"></a>6.1JDBC</h3><ul>
<li><p>6.1.1JDBC介绍</p>
<ul>
<li>Java数据库连接，（Java Database Connectivity，简称JDBC）是Java语言中用来规范客户端程序如何来访问数据库的应用程序接口，提供了诸如查询和更新数据库中数据的方法。JDBC也是Sun Microsystems的商标。我们通常说的JDBC是面向关系型数据库的。</li>
<li><p>jdbc作用</p>
<ul>
<li>建立于数据库的连接</li>
<li>向数据库发出查询请求</li>
<li>处理数据库返回结果</li>
</ul>
</li>
<li><p>6.1.2JDBC重要类和接口</p>
<ul>
<li><p>Connection接口</p>
<ul>
<li>Connection接口代表与特定的数据库的连接，在连接上下文中执行SQL语句并返回结果</li>
<li><p>常用方法</p>
<ul>
<li><p>createStatement()    </p>
<ul>
<li>创建Statement对象</li>
</ul>
</li>
<li><p>createStatement(int resultSetType,int resultSetConcurrency)</p>
<ul>
<li>创建一个Statement对象，该对象将生成具有给定类型、并发性和可保存性的ResultSet对象</li>
</ul>
</li>
<li><p>preparedStatement()    </p>
<ul>
<li>创建预处理对象preparedStatement</li>
</ul>
</li>
<li><p>isReadOnly()    </p>
<ul>
<li>查看当前Connection对象的读取模式是否是只读形式</li>
</ul>
</li>
<li><p>setReadOnly()    </p>
<ul>
<li>设置当前Connection对象的读写模式，默认是非只读模式</li>
</ul>
</li>
<li><p>commit()    </p>
<ul>
<li>使所有上一次提交/回滚后进行的更改成为持久更改，并释放此Connection对象当前持有的所有数据库锁</li>
</ul>
</li>
<li><p>roolback()    </p>
<ul>
<li>取消在当前事务中进行的所有更改，并释放此Connection对象当前持有的所有数据库锁</li>
</ul>
</li>
<li><p>close()    </p>
<ul>
<li>立即释放此Connection对象的数据库和JDBC资源，而不是等待它们被自动释放</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>Statement接口</p>
<ul>
<li>Statement接口用于在已经建立的基础上向数据库发送SQL语句</li>
<li><p>常用方法</p>
<ul>
<li><p>execute(String sql)    </p>
<ul>
<li>执行静态的SELECT语句，该语句可能返回多个结果集</li>
</ul>
</li>
<li><p>executeQuery(String sql)    </p>
<ul>
<li>执行给定的SQL语句，该语句返回单个ResultSet对象</li>
</ul>
</li>
<li><p>clearBatch()    </p>
<ul>
<li>清空此Statement对象的当前SQL命令列表</li>
</ul>
</li>
<li><p>executeBatch()    </p>
<ul>
<li>将一批命令提交给数据库来执行，如果全部命令执行成功，则返回更新计数组成的数组。数组元素的排序与SQL语句的添加顺序对应</li>
</ul>
</li>
<li><p>addBatch()    </p>
<ul>
<li>将给定的SQL命令添加到此Statement对象的当前命令列表中。如果驱动程序不支持批量处理，将抛出异常</li>
</ul>
</li>
<li><p>close()    </p>
<ul>
<li>释放Statement实例占用的数据库和JDBC资源</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>PreparedStatement接口</p>
<ul>
<li>PreparedStatement接口用来动态地执行SQL语句</li>
<li><p>常用方法</p>
<ul>
<li><p>setInt(int index,int k)    </p>
<ul>
<li>将指定位置的参数设置为int值</li>
</ul>
</li>
<li><p>setFloat(int index,float k)    </p>
<ul>
<li>将指定位置的参数设置为float值</li>
</ul>
</li>
<li><p>setLong(int index,long k)</p>
<ul>
<li>将指定位置的参数设置为long值</li>
</ul>
</li>
<li><p>setDouble(int index,double k)    </p>
<ul>
<li>将指定位置的参数设置为double值</li>
</ul>
</li>
<li><p>setBoolean(int index,boolean k)    </p>
<ul>
<li>将指定位置的参数设置为boolean值</li>
</ul>
</li>
<li><p>setDate(int index,date date)    </p>
<ul>
<li>将指定位置的参数设置为对应的date值</li>
</ul>
</li>
<li><p>executeQuery()</p>
<ul>
<li>在此PreparedStatement对象中执行SQL查询，并返回该查询生成的ResultSet对象</li>
</ul>
</li>
<li><p>setString(int index,String s)</p>
<ul>
<li>将指定位置的参数设置为对应的String值</li>
</ul>
</li>
<li><p>setNull(int index,intsqlType)</p>
<ul>
<li>将指定位置的参数设置为SQL NULL</li>
</ul>
</li>
<li><p>executeUpdate()</p>
<ul>
<li>执行前面包含的参数的动态INSERT、UPDATE或DELETE语句</li>
</ul>
</li>
<li><p>clearParameters()</p>
<ul>
<li>清除当前所有参数的值</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>DriverManager类</p>
<ul>
<li>DriverManager类用来管理数据库中的所有驱动程序。它是JDBC的管理层，作用于用户和驱动程序之间，跟踪可用的驱动程序，并在数据库的驱动程序之间建立连接</li>
<li><p>常用方法</p>
<ul>
<li><p>getConnection(String url,String user,String passward)</p>
<ul>
<li>指定三个入口参数(数据库的URL、用户名、密码)来获取与数据库的连接</li>
</ul>
</li>
<li><p>setLoginTimeout()</p>
<ul>
<li>获取驱动程序试图登录到某一数据库时可以等待的最长时间，单位为秒</li>
</ul>
</li>
<li><p>println(String message)</p>
<ul>
<li>将一条消息打印到当前的JDBC日志流中</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>ResultSet接口</p>
<ul>
<li>ResultSet接口类似于一个临时表，用来暂时存放数据库查询操作所获得的结果集</li>
<li><p>常用方法</p>
<ul>
<li><p>getInt()</p>
<ul>
<li>以int形式获取此ResultSet对象的当前行的指定列值。如果列值是NULL，则返回值是0</li>
</ul>
</li>
<li><p>getFloat()</p>
<ul>
<li>以float形式获取此ResultSet对象的当前行的指定列值。如果列值是NULL，则返回值是0</li>
</ul>
</li>
<li><p>getDate()</p>
<ul>
<li>以data形式获取此ResultSet对象的当前行的指定列值。如果列值是NULL，则返回值是null</li>
</ul>
</li>
<li><p>getBoolean()</p>
<ul>
<li>以boolean形式获取此ResultSet对象的当前行的指定列值。如果列值是NULL，则返回值是null</li>
</ul>
</li>
<li><p>getString()</p>
<ul>
<li>以String形式获取此ResultSet对象的当前行的指定列值。如果列值是NULL，则返回值是null</li>
</ul>
</li>
<li><p>getObject()</p>
<ul>
<li>以Object形式获取此ResultSet对象的当前行的指定列值。如果列值是NULL，则返回值是null</li>
</ul>
</li>
<li><p>first()</p>
<ul>
<li>将指针移到当前记录的第一行</li>
</ul>
</li>
<li><p>last()</p>
<ul>
<li>将指针移到当前记录的最后一行</li>
</ul>
</li>
<li><p>next()</p>
<ul>
<li>将指针向下移一行</li>
</ul>
</li>
<li><p>beforeFirst()</p>
<ul>
<li>将指针移到集合的开头</li>
</ul>
</li>
<li><p>afterLast()</p>
<ul>
<li>将指针移到集合的尾部</li>
</ul>
</li>
<li><p>absolute(int index)</p>
<ul>
<li>将指针移到ResultSet给定编号的行</li>
</ul>
</li>
<li><p>isFrist()</p>
<ul>
<li>判断指针是否位于当前ResultSet集合的第一行。如果是返回true，否则返回false</li>
</ul>
</li>
<li><p>isLast()</p>
<ul>
<li>判断指针是否位于当前ResultSet集合的最后一行。如果是返回true，否则返回false</li>
</ul>
</li>
<li><p>updateInt()</p>
<ul>
<li>用int值更新指定列</li>
</ul>
</li>
<li><p>updateFloat()</p>
<ul>
<li>用float值更新指定列</li>
</ul>
</li>
<li><p>updateLong()</p>
<ul>
<li>用指定的long值更新指定列</li>
</ul>
</li>
<li><p>updateString()</p>
<ul>
<li>用指定的string值更新指定列</li>
</ul>
</li>
<li><p>updateObject()</p>
<ul>
<li>用Object值更新指定列</li>
</ul>
</li>
<li><p>updateNull()</p>
<ul>
<li>将指定的列值修改为NULL</li>
</ul>
</li>
<li><p>updateDate()</p>
<ul>
<li>用指定的date值更新指定列</li>
</ul>
</li>
<li><p>updateDouble()</p>
<ul>
<li>用指定的double值更新指定列</li>
</ul>
</li>
<li><p>getrow()</p>
<ul>
<li>查看当前行的索引号</li>
</ul>
</li>
<li><p>insertRow()</p>
<ul>
<li>将插入行的内容插入到数据库</li>
</ul>
</li>
<li><p>updateRow()</p>
<ul>
<li>将当前行的内容同步到数据表</li>
</ul>
</li>
<li><p>deleteRow()</p>
<ul>
<li>删除当前行，但不同步到数据库中，而是在执行close()方法后同步到数据库</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>6.2创建SQL数据库</p>
<ul>
<li><p>学生管理系统数据库设计</p>
<ul>
<li><p>数据表介绍</p>
<ul>
<li><p>stu_user</p>
<ul>
<li>用户</li>
</ul>
</li>
<li><p>stu__major</p>
<ul>
<li>专业</li>
</ul>
</li>
<li><p>stu_student</p>
<ul>
<li>学生</li>
</ul>
</li>
<li><p>stu_cource</p>
<ul>
<li>课程</li>
</ul>
</li>
<li><p>stu_score</p>
<ul>
<li>成绩</li>
</ul>
</li>
</ul>
</li>
<li><p>数据库操作</p>
<ul>
<li><p>第一步 用SQL脚本创建数据表</p>
<ul>
<li>Create database stu;<br>Use stu;<br>/<em>创建用户表</em>/<br>Create table stu_user(<br>user_id int auto_increment primary key,<br>user_name varchar(30) not null,<br>user_pwd varchar(30),<br>user_datetime timestamp<br>);<br>/<em>创建专业表</em>/<br>Create table stu_major(<br>major_id int auto_increment primary key,<br>major_name varchar(30) not null unique<br>);<br>/<em>创建课程表</em>/<br>Create table stu_course<br>(<br>course_no varchar(6) primary key,<br>course_name varchar(30) not null unique,<br>course_teacher varchar(30)<br>);<br>/<em>创建学生表</em>/<br>Create table stu_student<br>(<br>student_no varchar(8) primary key,<br>major_id int not null references stu_major(major_id),<br>student_name varchar(30) not null,<br>student_sex varchar(2) not null,<br>student_birthDate datetime,<br>student_isMember bool,<br>student_address varchar(100),<br>student_resume text<br>);<br>/<em>创建成绩表</em>/<br>Create table stu_score<br>(<br>score_no varchar(8) references stu_student(student_no),<br>course_no varchar(30) references stu_cource(course_no),<br>score_score decimal(7,2) not null,<br>Primary key (score_no,course_no)<br>);</li>
</ul>
</li>
<li><p>第二部 给数据表添加新元素</p>
<ul>
<li>Insert into stu_user(user_name,user_pwd) values(<code>yang</code>,<code>1234</code>);<br>Insert into stu_major(major_name) values(<code>计算机科学与技术</code>);<br>Insert into stu_major(major_name) values(<code>电子</code>);<br>Insert into stu_major(major_name) values(<code>数据通信</code>);<br>Insert into stu_cource values(<code>120011</code>,<code>C语言</code>,<code>杨老师</code>);<br>Insert into stu_cource values(<code>120012</code>,<code>JAVA</code>,<code>张老师</code>);<br>Insert into stu_cource values(<code>120013</code>,<code>C语言</code>,<code>猫老师</code>);<br>Insert into stu_student(stu_no,major_id,stu_name,stu_sex,stu_birthDate,stu_isMember,stu_address) values(<code>101</code>,1,<code>张晓明</code>,<code>男</code>,1919-10-3<code>,1,</code>北京<code>);
Insert into stu_student(stu_no,major_id,stu_name,stu_sex,stu_birthDate,stu_isMember,stu_address) values(</code>102<code>,1,</code>张埃迪<code>,</code>男<code>,1979-10-3</code>,0,<code>北京</code>);<br>Insert into stu_student(stu_no,major_id,stu_name,stu_sex,stu_birthDate,stu_isMember,stu_address) values(<code>201</code>,2,<code>汪小菲</code>,<code>女</code>,1929-10-3<code>,1,</code>大连<code>);
Insert into stu_student(stu_no,major_id,stu_name,stu_sex,stu_birthDate,stu_isMember,stu_address) values(</code>202<code>,2,</code>滥用西<code>,</code>男<code>,1939-10-3</code>,0,<code>大连</code>);<br>Insert into stu_student(stu_no,major_id,stu_name,stu_sex,stu_birthDate,stu_isMember,stu_address) values(<code>203</code>,3,<code>貔貅</code>,<code>女</code>,1959-10-3<code>,1,</code>北京<code>);
Insert into stu_score values(</code>101<code>,</code>120011<code>,65);
Insert into stu_score values(</code>101<code>,</code>120012<code>,35);
Insert into stu_score values(</code>101<code>,</code>120013<code>,75);
Insert into stu_score values(</code>102<code>,</code>120011<code>,65);
Insert into stu_score values(</code>102<code>,</code>120012<code>,35);
Insert into stu_score values(</code>102<code>,</code>120013<code>,75);
Insert into stu_score values(</code>201<code>,</code>120011<code>,65);
Insert into stu_score values(</code>201<code>,</code>120012<code>,35);
Insert into stu_score values(</code>201<code>,</code>120013<code>,75);
Insert into stu_score values(</code>202<code>,</code>120011<code>,65);
Insert into stu_score values(</code>202<code>,</code>120012<code>,35);
Insert into stu_score values(</code>202<code>,</code>120013<code>,75);
Insert into stu_score values(</code>203<code>,</code>120011<code>,65);
Insert into stu_score values(</code>203<code>,</code>120012<code>,35);
Insert into stu_score values(</code>203<code>,</code>120013`,75);</li>
</ul>
</li>
</ul>
</li>
<li><p>JAVA连接数据库</p>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<h3 id="6-3-3MVC设计模式"><a href="#6-3-3MVC设计模式" class="headerlink" title="6.3.3MVC设计模式"></a>6.3.3MVC设计模式</h3><ul>
<li><p>Model：封装与应用程序的业务逻辑相关的数据以及对数据的处理方法</p>
<ul>
<li>数据模型</li>
<li>数据访问模型</li>
</ul>
</li>
<li><p>View：通过用户交互或数据展现的界面，由控制器调度</p>
</li>
<li>Controller：根据用户请求调用模型获取数据，通过使徒呈现给用户</li>
<li>案例6-2按MVC模式设计学生管理系统</li>
</ul>

      
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